Website:https://www.fibaro.com
Function:
FIBARO Switch 2 is designed to be installed in standard wall switch boxes or anywhere else where it is necessary to control electric devices. FIBARO Switch 2 allows to control connected devices either via the Z-Wave+ network or via a switch connected directly to it and is equipped with active power and energy consumption metering functionality.

I am using FGS-213 with no problems. It has some references to dimming, but I think that is because you can use switches connected to the FGS-213 to control other dimming receivers.
On my system where it has NodeID 0x0a the ID in devices are 00000A02. In your case with 0x20 I would think the ID in devices should be 00002002.

I compared your XML with mine, and you have the correct lines for the switches: